Abstract: The present invention is relative to a video signal transmitting/receiving system in which digital video signals are transmitted from a transmitter (30) to a receiver (50) using a line (9) as a transmission channel. The transmitter (30) converts the video signals to be transmitted to a bit string longer in data length than a pixel making up the video signals, allocates a plural number of the bit strings to a blanking period during which pixel data in the pixel string is not transmitted and, using these bit strings, transmits the same superposed data a plural number of times. The receiver (50) extracts the specified bit strings indicating the blanking period from the received data and performs majority processing on the results of demodulation of the extracted bit strings to decide on output data. This reduces errors in reception of supplementary data to simplify the circuit structure as well as to ameliorate the error rate.

Abstract: An original blanking period of a video signal is shortened to a set blanking period, and audio data is multiplexed into a resulting superimposing period. Table distinguishing data indicating the length of the superimposing period is inserted into the period as a blanking signal. With this configuration, it is possible to enable transmission and reception of an audio signal in a system capable of transmitting and receiving a video signal.

Abstract: A data transmission device transmits a data broadcast using a narrow unused broadcasting band in a digital broadcast, and to record the data broadcast, which has been received, on a receiving side so that the receiving side can play back the data broadcast after a data stream is totally recorded. The transmission device generates a first data stream, which is recorded on a recording medium on a receiving side, and a second data stream including audio and video data, which is transmitted as a broadcasting program. The transmission device multiplexes the first and the second data streams and then transmits the multiplexed data stream. The transmission of the multiplexed data stream is controlled so that a transmission rate for the multiplexed data stream does not exceed the maximum transmission rate, and so that a transmission rate for the first data stream becomes lower than that for the second data stream.

Abstract: A noble metal-supported article which comprises a carrier and a palladium-containing metal component supported on the carrier, which article has (A) a layer in which substantially no palladium is supported in the interior of the carrier and (B) a layer in which palladium is supported in the region from the outer surface to a depth of less than 100 &mgr;m of the carrier.

Abstract: An contour correcting circuit for correcting the contour without deterioration of image quality of the video signal, comprising a first HPF for extracting the high frequency signal component of the video signal supplied from an input terminal Tin, a second HPF for differentiating the output of the first HPF additionally, and a correlator for synthesizing the output signals of the output and the inverted output of said first HPF, and the output of the second HPF to form a signal having a predetermined signal waveform, wherein the correlator forms a signal waveform of the preshoot portion and overshoot portion with the first order differential output which is relatively static at the inflection point of the video signal, synthesizes a second order differential waveform so as to be a sharp signal waveform at the middle portion, and performs sharpness processing of the video signal by use of the contour correction signal.

Abstract: The invention provides data transmission and reception methods and apparatus by which timer reservation of a program can be performed readily. A data signal including program information generated from a program information generation section is added to modulate an audio information signal supplied from an audio signal supply section by an addition modulation section. In the addition modulation, the audio information signal is phase modulated at a delineating point of sound thereof such as chimes or musical sound with the data signal. Together with the audio information signal phase modulated with the data signal, the audio information signal prior to the phase modulation is transmitted as a reference signal to be used for demodulation.

Abstract: A process for producing a methacrylic acid ester or an acrylic acid ester comprising: reacting methacrolein or acrolein with an alcohol or molecular oxygen in the presence of a catalyst comprising Pd; removing water with a separation membrane which can selectively permeate water from a mixed liquid of the alcohol and water.

Abstract: Disclosed is a method for producing methyl methacrylate, which comprises: subjecting isobutylene and/or tert-butanol to a gas phase catalytic oxidation reaction with molecular oxygen to thereby obtain gas (a) containing methacrolein gas and steam; introducing gas (a) and a methacrolein/methanol liquid mixture (I) into a dehydration tower at a lower portion thereof and at an upper portion thereof, respectively, thereby allowing the liquid mixture (I) to flow downwardly in the dehydration tower and contact countercurrently with the gas (a) in the dehydration tower, to thereby obtain a dehydrated gas mixture (b) containing methacrolein gas and methanol gas; introducing the dehydrated gas mixture (b) and a methacrolein/methanol liquid mixture (II) into an absorption tower at a lower portion thereof and at an upper portion thereof, respectively, thereby allowing the liquid mixture (II) to flow downwardly and contact countercurrently with the dehydrated gas mixture (b) in the absorption tower, thereby obtaining a m

Abstract: A method for producing an aromatic polycarbonate comprises introducing to an introduction zone (having a perforated plate) a) a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, or b) a molten prepolymer obtained by a process comprising reacting an aromatic dihydroxy compound with a diaryl carbonate, and allowing the monomer mixture or prepolymer in the molten state to pass downwardly through the perforated plate and fall freely through a free-fall polymerization reaction zone, thereby effecting polymerization of the monomer mixture or prepolymer during the free-fall thereof. Colorless and high quality aromatic polycarbonates are thus stably produced at a high polymerization rate for a prolonged period of time, using an apparatus which has excellent sealing properties under high vacuum and maintenance of which is easy.

Abstract: A method for producing an aromatic polycarbonate comprises feeding to a feeding zone (having a foraminous plate) at least one polymerizing material selected from the group consisting of a) a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, and b) a molten prepolymer obtained by a process comprising reacting an aromatic dihydroxy compound with a diaryl carbonate, and allowing the polymerizing material to pass downwardly through the foraminous plate and fall along and in contact with a wire through a wire-wetting fall polymerization reaction zone, thereby effecting polymerization of the polymerizing material during the wire-wetting fall thereof. Colorless and high quality aromatic polycarbonates are thus stably produced at a high polymerization rate for a prolonged period of time, using an apparatus which has excellent sealing properties under high vacuum and maintenance of which is easy.

Abstract: A recording current setting method comprises the steps of: recording signals on a tape by changing, by steps, recording current for the tape; detecting a reproduced signal level at each recording current; and determining an optimal recording current from a middle point between a first recording current at which a reproduced signal level first exceeds a threshold level as a result of increasing, by steps, the recording current and a second recording current at which a reproduced signal level first exceeds the threshold level as a result of decreasing, by steps, the recording current. An information signal recording apparatus using the method is also disclosed.

Abstract: A video tape recorder has a recording current setting unit for setting recording currents to be supplied to a recording head for recording audio and video signals on a magnetic tape. The recording current setting unit controls electronic volume controls to adjust and output audio and video signals to set the recording currents. Level detectors detect reproduced signals, which have been recorded on the magnetic tape by the recording head, and supply the detected signals to the recording current setting unit. The recording current setting unit controls the electronic volume controls to hold the audio signal at a constant level and to simultaneously vary levels of luminance and chrominance signals of the video signal with the levels being kept at a constant ratio, and at the same time controls the recording head to preliminarily magnetically record the audio and video signals on the magnetic tape.

Abstract: Method for the regeneration of an activated carbon having adsorbates adsorbed therein characterized by removing the adsorbates by liquid dimethyl ether or a mixture of liquid dimethyl ether and water. By such method, the spent carbon can be effectively regenerated without degrading the absorption capacity and mechanical strength thereof. Further, valuable substances in the desorbed adsorbates can be effectively concentrated and recovered by a simple additional operation.